Fix some type definitions for the WORDS_BIGENDIAN case

[Dmitry Timoshkov]

"Alexandre Julliard" <julliard at winehq.org> wrote:

> I'm not sure what you are trying to achieve here. If you want to load
> little-endian files on big-endian machines, you need to swap
> everything; swapping only the signature is not going to do any good.

My aim is to make winebuild generate a proper PE header for builtin
DLLs and allow kernel32 to properly detect PE executables. Btw, that's
what PSDK headers have.

-- 
Dmitry.